Arsenal youngster Matteo Guendouzi is at risk of throwing away his career.
The latter has experience of being a young star with the London club who never fulfilled his potential.
Guendouzi is reportedly training alone after a bust up with manager Mikel Arteta after his side's defeat to Brighton two weeks ago.
"I'm sure deep inside he is disappointed if he has to leave Arsenal like this," Aliadiere told football.london.
"But from what has been said in the press he has obviously got all the top clubs after him. I'm sure he won't end up at a smaller club.
"If he moves he'll end up at a top club somewhere. I don't know if he really thinks, 'I'm gutted that I might be sold by Arsenal' or will he think, 'It's their loss, I'm going to go to Madrid, Barcelona or Paris'.
"It's hard. When you're young you just don't think of the consequences in the long term. A bad experience, a second bad experience, a third bad experience. Eventually if you have enough bad blood at clubs it will impact your career.
"That's what I'm more concerned about for him, having all that talent, having made it at a top club so young and throwing it all away. I would be gutted for him. I saw him at 16 and thought he would become a top player.
"I know Matteo, he's like a little brother to me. I was buzzing when he joined the club, I'm gutted to see him in that situation now, to be training on his own because of his own actions.
"When you've got a problem with one coach, with a second coach, with a third coach. I take it it might not be the coach.
"It might be something you're doing wrong. I know he has had trouble at Lorient with two managers, before when he was a very young kid as well and now he's having trouble with Arteta. It can't all be the managers all the time.
"He has passion for the club, you know that every time he plays he gives 100 per cent. That's what's sad about it. If you had a player who was not giving 100 per cent you'd be keen to sell him.
"But it's not on the pitch, it's attitude in training, around the training ground, on camps abroad and outside games. That's what makes it even more disappointing."